CN104519527A - Device and method for load balancing in wireless communication system, and base station - Google Patents

Device and method for load balancing in wireless communication system, and base station Download PDF

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Publication number
CN104519527A
CN104519527A CN201310456549.7A CN201310456549A CN104519527A CN 104519527 A CN104519527 A CN 104519527A CN 201310456549 A CN201310456549 A CN 201310456549A CN 104519527 A CN104519527 A CN 104519527A
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China
Prior art keywords
cell
small
unloading
load balancing
interference
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CN201310456549.7A
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Chinese (zh)
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CN104519527B (en
Inventor
许晓东
于翠波
孙玉
高瑞
魏立尧
李先栋
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Sony Corp
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Sony Corp
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Priority to CN201310456549.7A priority Critical patent/CN104519527B/en
Priority to US14/895,168 priority patent/US9763138B2/en
Priority to PCT/CN2014/087676 priority patent/WO2015043523A1/en
Publication of CN104519527A publication Critical patent/CN104519527A/en
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Publication of CN104519527B publication Critical patent/CN104519527B/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/06—Hybrid resource partitioning, e.g. channel borrowing
    • H04W16/08—Load shedding arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • H04W28/09—Management thereof
    • H04W28/0958—Management thereof based on metrics or performance parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • H04W28/086—Load balancing or load distribution among access entities
    • H04W28/0861—Load balancing or load distribution among access entities between base stations
    • H04W28/0862—Load balancing or load distribution among access entities between base stations of same hierarchy level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/04—Reselecting a cell layer in multi-layered cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/22—Performing reselection for specific purposes for handling the traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/304—Reselection being triggered by specific parameters by measured or perceived connection quality data due to measured or perceived resources with higher communication quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/20—Performing reselection for specific purposes for optimising the interference level

Abstract

The invention provides a device and a method for load balancing in a wireless communication system, and a base station. The device comprises an interference monitoring part configured to monitor interference between small cells caused by the load balancing process, and a load balancing control part configured to adjust the load balancing process according to the interference between small cells monitored by the interference monitoring part.

Description

For apparatus and method and the base station of the load balancing in wireless communication system
Technical field
The application relates generally to wireless communication field, more specifically, relates to the apparatus and method for the load balancing in wireless communication system, and corresponding macro base station and little base station.
Background technology
The heterogeneous network proposed in LTE-A standard is made up of dissimilar base-station node, and wherein dissimilar base station can comprise the little base station of macro base station and such as femto cell and Home eNodeB etc.By disposing small-cell and bearing a part of business load by small-cell, the load of macrocell can be alleviated.In addition, between contiguous small-cell, also load balancing process can be carried out, to alleviate the situation of part small-cell overload.By carrying out load balancing, the throughput of network can be increased.
Summary of the invention
Give hereinafter about brief overview of the present invention, to provide about the basic comprehension in some of the present invention.Should be appreciated that following general introduction is not summarize about exhaustive of the present invention.It is not that intention determines key of the present invention or pith, and nor is it intended to limit the scope of the present invention.Its object is only provide some concept in simplified form, in this, as the preorder in greater detail discussed after a while.
According to an embodiment of the application, provide a kind of device for the load balancing in wireless communication system.This device comprises: interference monitoring part, is configured to monitor the interference between the small-cell that caused by load balancing process; And load balancing control section, be configured to adjust load balancing process according to the interference between the small-cell that monitored by interference monitoring part.
According to another embodiment of the application, provide a kind of method for the load balancing in wireless communication system.The method comprises: monitor the interference between the small-cell that caused by load balancing process; And adjust load balancing process according to the interference between monitored small-cell.
According to another embodiment of the application, provide a kind of macro base station.This macro base station comprises: interfere information acquisition device, is configured to obtain interfere information, and this interfere information comprises: the information of the interference causing the contiguous small-cell unloading Target cell to be subject to about being carried out unloading to small-cell by described macro base station; And load balancing apparatus, be configured to the load balancing process of carrying out between small-cell according to this interfere information.
According to another embodiment of the application, provide a kind of little base station.This little base station comprises: interfere information acquisition device, be configured to obtain interfere information, this interfere information comprises: be subject to the information of the interference from this small-cell after being unloaded to Target cell from this small-cell about unloading object user, or causing this vicinity small-cell to the information of the interference of this small-cell about accepting unloading by contiguous small-cell; And load balancing apparatus, be configured to the load balancing process of carrying out between other small-cells according to this interfere information.
Utilize the apparatus and method for load balancing according to the embodiment of the present application, according to the disturbed condition adjustment load balancing process produced in load balancing process, in the small-cell that the equilibrium between such as macrocell unloading and small-cell can be avoided to cause, disturb the problem increased the weight of.
Accompanying drawing explanation
The present invention can be better understood by reference to hereinafter given by reference to the accompanying drawings description, wherein employs same or analogous Reference numeral in all of the figs to represent identical or similar parts.Described accompanying drawing comprises in this manual together with detailed description below and forms the part of this specification, and is used for illustrating the preferred embodiments of the present invention further and explaining principle and advantage of the present invention.In the accompanying drawings:
Fig. 1 is the block diagram of the configuration example of the device for the load balancing in wireless communication system illustrated according to the embodiment of the present application;
Fig. 2 is the block diagram of the configuration example of the device for the load balancing in wireless communication system illustrated according to another embodiment of the application;
Fig. 3 is the schematic diagram of the example determined for illustration of the unloading source/target of load balancing process;
Fig. 4 is the block diagram of the configuration example of the device for the load balancing in wireless communication system illustrated according to the another embodiment of the application;
Fig. 5 is the flow chart of the process example of the method for the load balancing in wireless communication system illustrated according to the embodiment of the present application;
Fig. 6 is the flow chart of the process example of the method for the load balancing in wireless communication system illustrated according to another embodiment of the application;
Fig. 7 is the flow chart of the process example of the method for the load balancing in wireless communication system illustrated according to the another embodiment of the application;
Fig. 8 A to Fig. 8 C illustrates the flow chart for the process example in the method for the load balancing in wireless communication system according to the embodiment of the present application;
Fig. 9 is the block diagram of the configuration example of the macro base station illustrated according to the embodiment of the present application;
Figure 10 is the block diagram of the configuration example of the little base station illustrated according to the embodiment of the present application; And
Figure 11 is the block diagram of the example arrangement of the computer that the method and apparatus realizing the application is shown.
Embodiment
Below with reference to accompanying drawings embodiments of the invention are described.The element described in an accompanying drawing of the present invention or a kind of execution mode and feature can combine with the element shown in one or more other accompanying drawing or execution mode and feature.It should be noted that for purposes of clarity, accompanying drawing and eliminate expression and the description of unrelated to the invention, parts known to persons of ordinary skill in the art and process in illustrating.
As shown in Figure 1, interference monitoring part 110 and load balancing control section 120 is comprised according to the device 100 for the load balancing in wireless communication system of the embodiment of the present application.Interference monitoring part 110 is configured to monitor the interference between the small-cell that caused by load balancing process.Load balancing control section 120 is configured to adjust described load balancing process according to the interference between the small-cell that monitored by interference monitoring part 110.
The device for load balancing according to the embodiment of the present application can be arranged in little base station, macro base station or core network entity.
Load balancing process corresponds to process that business load is born from a community (namely unloading cell-of-origin) turning by another community (namely unloading Target cell) in wireless communication system.Wherein, unload cell-of-origin and unloading Target cell and can comprise macrocell or small-cell.The embodiment of the present application is especially for the process that the process unloaded to small-cell from macrocell that interference may to be caused in small-cell to increase the weight of and carrying out between small-cell unloads.
Unloading cell-of-origin in load balancing process and unloading Target cell can be determined in several ways according to the business load of macrocell or small-cell.According to an embodiment of the application, compare according to the average traffic load capacity of the small-cell bunch at the business load amount of managed small-cell and its place and determine unloading cell-of-origin in load balancing process or unload Target cell.In addition, according to the embodiment of the application, unloading cell-of-origin and unloading Target cell can also be determined when considering the QoS requirement of business load.
Brief description is carried out to the business load of different service quality demand below.
Usually, intra-cell resource roughly can be divided into signal resource block (SRB), ensure bit rate (GBR) business, non-ensured bit rate (non-GBR) business etc.Traditional load balancing process by knowing that the mode of adjacent cell Resource Block occupancy judges load balancing target.But which does not consider the quality of service requirement of business load, therefore which is not optimum.
Such as, in the Resource Block of certain community greatly for non-GBR business and its resource be only provided to minority carry out the user of non-GBR business when, even if the Resource Block occupancy of this community is higher (such as, a lot of non-GBR service resources blocks is assigned to these users to allow it quick-downloading), also some resources of this community can be used for load balancing, especially for the user carrying out non-GBR business, the resource release part shared by these users can be used for bearing load.In this case, the resource shared by it can be reduced when not affecting business satisfaction.On the other hand, such as may there is such situation: there is a certain proportion of slack resources certain community, but because in fact some these slack resources of specific reason can not be used for load balancing, more reserved Resource Block such as high data volume, high call rate etc. such as in order to happen suddenly.In this case, only correctly can not make according to Resource Block occupancy the judgement whether should carrying out load balancing.
As shown in Figure 2, interference monitoring part 210, load balancing control section 220 and unloading source/target determining section 230 is comprised according to the device 200 for load balancing of the embodiment of the present application.Wherein, the configuration of interference monitoring part 210 and load balancing control section 220 with above with reference to the interference monitoring part 110 described in Fig. 1 and load balancing control section 120 similar, do not repeat them here.
But the device for load balancing according to the embodiment of the present application also can not comprise interference monitoring part and load balancing control section, and only includes unloading source/target determining section.That is, the embodiment of the application also comprises the device of unloading cell-of-origin and the unloading Target cell being used in particular for determining load balancing process.
The business load amount that unloading source/target determining section 230 is configured to the one or more small-cells managed according to device 200 and the average traffic load capacity of small-cell bunch overall calculation of small-cell comprising multiple vicinity, determine the unloading cell-of-origin in load balancing process and/or unloading Target cell.
In addition, unloading source/target determining section 230 is also configured to determine unloading cell-of-origin and/or unloading Target cell according to the QoS requirement of different business load.As below by detailed description, unloading source/target determining section 230 can distribute according to Resource Block ratio R shared by GBR traffic and/or user the unloading cell-of-origin and/or unloading Target cell that the non-GBR service resources number of blocks R ' obtained determines load balancing process.Wherein, can determine separately unloading source and the unloading target of corresponding service according to the load of GBR traffic and the loading condition of non-GBR business respectively, the loading condition that also can consider different kinds of business is to carry out above-mentionedly determining.
When the present invention comprises the load balancing apparatus of unloading source/target determining section 230 small-cell multiple for centralized management, such as be arranged at core net or macro base station side, this load balancing apparatus determines unloading cell-of-origin in multiple small-cell and/or unloading Target cell, and send relevant information to each small-cell, so that itself is known in each small-cell and/or other small-cells are unloading cell-of-origin or unloading Target cell, thus directly can perform suitable load balancing process, reduce operation such as mutual confirmation grade before unloading between each small-cell.
The following describes Resource Block ratio R and/or user shared by GBR traffic and can distribute the unloading cell-of-origin that the non-GBR service resources number of blocks R ' obtained determines load balancing process and/or the embodiment unloading Target cell.Unloading source/target determining section 230 can determine unloading cell-of-origin and the unloading Target cell of the load balancing process of GBR traffic according to Resource Block ratio R shared by GBR traffic.In addition, unloading source/target determining section 230 can distribute according to user the unloading cell-of-origin and unloading Target cell that the non-GBR service resources number of blocks R ' obtained determines the load balancing process of non-GBR business.
Wherein, ratio R or amount R ' can be small-cell bunch overall calculation for comprising multiple contiguous small-cell, to be used for determining the thresholding of respective load balancing procedure between the small-cell in this small-cell bunch.Another small-cell at least and wherein, any one small-cell in described multiple contiguous small-cell is contiguous, thus between each small-cell in this small-cell bunch can directly or indirectly (the one or more small-cells via in small-cell bunch) carry out load balancing, in ideal conditions, optimum resource distribution can be reached by load balancing process in whole small-cell bunch.The present inventor considers whole small-cell bunch average occupation condition and/or can arrange resource situation, determine the thresholding of the load balancing of each small-cell in small-cell bunch, and different load balancing thresholdings may be had for different small-cell bunch, specifically depend on resource situation in its bunch, this contributes to realizing rational load balancing, reduces the user's switching times caused because of load balancing process.For Resource Block ratio R shared by GBR traffic, such as, unloading source/target determining section 230 can be known (such as, when device 200 is positioned at macro base station side, can by bunch in each little base station report loading condition to know to macro base station; When device 200 is positioned at little base station side, can by with bunch in each little base station communication or communicate with macro base station know; When device 200 is positioned at core network side, can by bunch in each little base station report or known by macro base station) in small-cell bunch all small-cells SRB and GBR shared by Resource Block total amount, and the available Physical Resource Block total amount of small-cell bunch entirety, and calculate ratio R by following formula (1):
R = Σ ( SRB i + GBR i ) Σ PRB i × 100 % - - - ( 1 )
Wherein, SRB ibe i-th cell allocation to the quantity of the Resource Block of SRB, GBR ibe i-th cell allocation to the quantity of the Resource Block of GBR traffic, PRB ithe physical resource number of blocks that ShiiGe community is total.In this example, when calculating Resource Block ratio shared by GBR traffic, the Resource Block shared by SRB is taken into account, this is because signaling is extremely important for communication system, it is the same with GBR traffic is the signal needing to ensure the quality of products, and the ratio R calculated according to this example more can reflect the important service loading condition of small-cell.Those skilled in the art can understand, and in the middle of other example, such as, consider that the Resource Block quantity shared by SRB is little, also SRB can not be counted in Resource Block ratio shared by GBR traffic.
Correspondingly, unloading source/target determining section 230 can for each small-cell in small-cell bunch, such as, utilize formula (1a) to calculate the ratio R of each small-cell i:
R i = SRB i + GBR i PRB i × 100 % - - - ( 1 a )
Wherein, SRB ibe i-th cell allocation to the quantity of the Resource Block of SRB, GBR ibe i-th cell allocation to the quantity of the Resource Block of GBR traffic, PRB ithe physical resource number of blocks that ShiiGe community is total.Similarly, those skilled in the art can understand, and in the middle of other example, also SRB can not be counted in Resource Block ratio shared by GBR traffic.
The non-GBR service resources number of blocks obtained R ' can be distributed for user, such as, unloading source/target determining section 230 can know the total number of users using non-GBR business in the PRB sum that the non-GBR business of all small-cells in small-cell bunch takies, the idle PRB sum can distributing to non-GBR business and small-cell bunch, and calculates R ' by following formula (2):
R ′ = Σ ( PRB i - SRB i - GBR i - PBR i ′ ) Σ UE i - - - ( 2 )
Wherein, PRB i-SRB i– GBR i-PBR ' irepresent non-GBR or assignable idling-resource number of blocks in the i of small-cell, PBR ' irepresent the quantity of Resource Block reserved in the i of small-cell, UE iit is the number of users using non-GBR business in the i of small-cell.
Correspondingly, unloading source/target determining section 230 can for each small-cell in small-cell bunch, and the user such as utilizing formula (2a) to calculate each small-cell can distribute the non-GBR service resources number of blocks obtained R ' i:
P i ′ = PRB i - SRB i - GBR i - PBR i ′ UE i - - - ( 2 a )
Wherein, PRB i-SRB i– GBR i-PBR ' irepresent non-GBR or assignable idling-resource number of blocks in the i of small-cell, PBR ' irepresent the quantity of Resource Block reserved in the i of small-cell, UE iit is the number of users using non-GBR business in the i of small-cell.
Aforementioned proportion R or amount R ' be only used to the example of the index of reflected load situation, it may occur to persons skilled in the art that other indexs are to weigh the loading condition of different business.Further, the application is not limited by unloading cell-of-origin and the unloading Target cell of above-mentioned concrete mode determination load balancing.Such as, the non-GBR service resources number of blocks obtained R ' can be distributed for user, the quantity of reserved Resource Block can not be considered.
Unloading source/target determining section 230 is passed through the aforementioned proportion R of small-cell ior amount R ' iwith corresponding proportion R or the amount R of small-cell bunch ' (as thresholding) compare, to determine unloading cell-of-origin and the unloading Target cell of load balancing.Such as, can using load level higher than threshold value small-cell as unloading cell-of-origin, using load level lower than threshold value small-cell as unloading Target cell.
In addition, according to an embodiment, unloading source/target determining section can be configured in the thresholding of the load balancing process of GBR traffic and non-GBR business, introduce corresponding predetermined amount of hysteresis for determining unloading cell-of-origin and unloading Target cell, to avoid, between unloading cell-of-origin and unloading Target cell, ping-pong occurs.
Below ping-pong is briefly described.For traditional load balancing behavior, such as, in the scene of small-cell dense deployment, ping-pong may be caused when multiple small-cell selects a small-cell to unload simultaneously.Such as, when small-cell A and small-cell B selects to unload to small-cell C simultaneously, but the possibility of result causes small-cell C to transship, and then small-cell C can unload to small-cell A and small-cell B again.This ping-pong can cause the waste of system resource.
According to this embodiment of the application, by introducing amount of hysteresis in the thresholding of load balancing process, above-mentioned ping-pong can be helped avoid.Such as, as shown in Figure 3, suppose that small-cell bunch comprises 1 to small-cell, small-cell n, and calculate Resource Block ratio R shared by GBR traffic for this small-cell bunch, (namely the small-cell (small-cell 2 in such as Fig. 3) that Resource Block ratio value shared by GBR traffic can be less than R is defined as low load small-cell, can as unloading target small-cell), (namely the small-cell (small-cell 3 in such as Fig. 3) that Resource Block ratio value shared by GBR traffic is greater than R+ δ is defined as high capacity small-cell, can as unloading source small-cell), and (namely the small-cell of Resource Block ratio value between R and R+ δ shared by GBR traffic (small-cell 1 in such as Fig. 3 and small-cell n) can be confirmed as normal load small-cell, can neither as unloading source also not as unloading the small-cell of target).
Again such as, suppose that small-cell bunch comprises 1 to small-cell, small-cell n, and calculate average each user for this small-cell bunch and can distribute the non-GBR service resources number of blocks obtained R ', each user can be distributed the small-cell that the non-GBR service resources number of blocks obtained is less than R ' and be defined as low-resource small-cell (namely, can as unloading source small-cell), each user can be distributed the small-cell that the non-GBR service resources number of blocks obtained is greater than R '+δ ' and be defined as high resource small-cell (namely, can as unloading target small-cell), and each user can distribute the small-cell of non-GBR service resources number of blocks between R ' and R '+δ ' obtained can be confirmed as normal resource small-cell (namely, can neither as unloading source also not as unloading the small-cell of target).
Certainly, the application is not limited to arrange thresholding as concrete example above.Such as, as above high capacity small-cell and low load small-cell can be determined according to R and R+ δ, also high capacity small-cell and low load small-cell can be determined according to R-δ and R or R-δ and R+ δ.
It should be noted that, in the above example, ratio R and amount R ' be independently be used for determining to ensure the unloading source of bit rate service and non-ensured bit rate service and the small-cell of unloading target.In one embodiment of the invention, judge that small-cell is the high capacity small-cell of GBR traffic according to ratio R, because the needs of GBR traffic guarantee service quality, according to this result, its priority higher than non-GBR business, then can directly determine that this small-cell all can not as unloading Target cell for GBR traffic or non-GBR business.In another embodiment of the present invention, proportion of utilization R and amount R ' combination determine to be applicable to unloading source and/or the unloading target small-cell of GBR and non-GBR business simultaneously.Particularly, the small-cell that Resource Block ratio value shared by GBR traffic is greater than R+ δ is defined as small-cell, unloading source, small-cell Resource Block ratio value shared by GBR traffic being less than R is defined as candidate and unloads target small-cell, candidate is unloaded average each user in target small-cell can distribute the small-cell that the non-GBR service resources number of blocks obtained is greater than R ' and be defined as unloading target small-cell, the GBR that this unloading target small-cell both can accept to unload also can accept non-GBR business load.Utilize this embodiment to determine to unload target small-cell, then do not need first to judge specifically any business load, and can directly determine whether to accept this business load.Similar, those of ordinary skill in the art can according to example of the present invention, by ratio R or amount R ' do the combination of other modes, or be combined with other conditions of the prior art and be used for determining small-cell, unloading source and unloading target small-cell, for purpose of brevity, do not enumerate at this.
In addition, except introducing except amount of hysteresis in triggering thresholding, also lag time can be introduced to avoid ping-pong in the uninstall process of load balancing.Such as, do not switch immediately after determining to meet load balancing condition, but just switch when still meeting load balancing condition after predetermined lag time.Thus, the appearance of ping-pong can be avoided further.
In addition, for situation about unloading from macrocell to small-cell, except can according to except the loading condition of small-cell adjustment load balancing process, also can according to the overall load situation adjustment load balancing process of small-cell bunch.According to an embodiment, load balancing control section can be configured to: the small-cell bunch aforementioned proportion R being greater than to predetermined threshold, does not carry out the unloading of macrocell to small-cell to small-cell wherein.That is, when certain small-cell bunch has reached certain load level on the whole, then no longer it has been unloaded, to avoid this small-cell bunch overall load level too high.
Next, the concrete example of the device for load balancing of the embodiment according to the application is described.
According to an embodiment, interference monitoring part is configured to: monitor in the interference be subject to the contiguous small-cell that unloading Target cell carries out unloading Target cell in the process unloaded by unloading cell-of-origin.Further, load balancing control section is configured to the adjustment determining uninstall process according to this monitoring result of interference monitoring part.Wherein, unload cell-of-origin and can comprise to the unloading unloading Target cell the unloading carrying out from macrocell to small-cell unloading or carrying out between small-cell.
For the balancing procedure that macrocell unloads to small-cell, interference monitoring part can be configured to: monitor the interference that the contiguous small-cell that unloads Target cell in the process of to be carried out to small-cell unloading by macrocell is subject to.Load balancing control section can be configured to: determine whether to proceed follow-up uninstall process according to this monitoring result of interference monitoring part.
In the process unloaded from macrocell to small-cell, some parts can be divided into by needing the user of unloading, point several times unloading.After each unloading completes, the disturbed condition in small-cell may change, and interference monitoring part can detect this disturbed condition.
Such as, when being positioned at macro base station side according to the device for load balancing of the embodiment of the present application, can carry out in the following manner the interference monitoring in small-cell: macro base station links with each small-cell (such as passing through optical fiber), thus directly monitor the disturbed condition of each small-cell; Or disturbed condition can be reported macro base station by each small-cell, thus the disturbed condition in macro base station side to small-cell is monitored.But the application is not limited to these concrete modes.
When point several times unload, the significantly change all causing small-cell frequency overall spectral efficiency level might not be unloaded at every turn, but following situation may be there is:
1) only have a small amount of user's interference level to exceed predeterminated level in small-cell, such as Reference Signal Received Quality (RSRQ) is lower than threshold value, but the overall spectral efficiency of small-cell too large change does not occur.In this case, can consider only to switch for being disturbed more serious certain customers;
2) interference level of small-cell entirety exceedes predeterminated level, the spectrum efficiency of such as small-cell is reduced to certain threshold value, or the user that in small-cell, interference level exceedes predeterminated level (such as RSRQ is lower than threshold value) reaches predetermined quantity, then show that community entirety is disturbed comparatively serious.When exist this be disturbed more serious community when, can know which community be disturbed around community be before unloading Target cell, and make these small-cells not be re-used as Target cell.In addition, suitable process can also be carried out to being disturbed serious user.
Correspondingly, according to a specific embodiment, load balancing control section can be configured to: when the interference caused due to the contiguous small-cell of unloading to unloading Target cell exceedes predeterminated level, the user of interference is caused to switch back macrocell by due to its unloading, and no longer using the unloading object of this user as discharged later process.
According to another specific embodiment, interference monitoring part can be configured to: monitor the quantity of Reference Signal Received Quality lower than the user of predeterminated level owing to causing the spectrum efficiency of the contiguous small-cell of this unloading Target cell or contiguous small-cell to the unloading of unloading Target cell.And, load balancing control section can be configured to: when the spectrum efficiency of this vicinity small-cell reaches predetermined quantity lower than the Reference Signal Received Quality of predetermined threshold or contiguous small-cell lower than the user of predeterminated level, make this unloading Target cell in follow-up load balancing process, not be re-used as unloading Target cell.Wherein, small-cell spectrum efficiency computational methods are known in the art, do not repeat them here.
In the process unloaded from macrocell to small-cell, because user such as can select unloading Target cell according to RSRQ, therefore user can not be subject to severe jamming usually in target small-cell.Consider because the load of Target cell increases the interference causing producing its contiguous small-cell so macrocell is main in the uninstall process of small-cell.
By contrast, for the load balancing process between small-cell, then may there is the interference with Types Below: unloading object user, after being discharged into unloading Target cell, is subject to the interference of self-unloading cell-of-origin; And the load due to Target cell increases the interference causing producing its contiguous small-cell.
Therefore, according to an embodiment of the application, interference monitoring part can be configured to monitoring unloading object user after being discharged into unloading Target cell, is subject to the interference of self-unloading cell-of-origin; In addition, the interference of unloading Target cell to its contiguous small-cell that interference monitoring part can also be configured to the unloading of unloading Target cell causes is monitored.Correspondingly, load balancing control section can be configured to the corresponding adjustment determining uninstall process according to this monitoring result.
According to a specific embodiment, load balancing control section is configured to: when the interference that unloading object user is subject to self-unloading cell-of-origin after being discharged into unloading Target cell exceedes predeterminated level, notice unloading cell-of-origin progressively reduces power according to predetermined step-length, to reduce the interference to this unloading object user.By this configuration, can reduce to unload cell-of-origin to the interference being discharged into the user unloading Target cell.
According to another specific embodiment, load balancing control section is configured to: when unloading object user causes the interference of its contiguous small-cell to exceed predeterminated level due to the increase unloading Target cell load after being discharged into unloading Target cell, the user that is disturbed of this vicinity small-cell is switched to this unloading Target cell, and progressively reduces the power of this vicinity small-cell according to predetermined step-length.By this configuration, the interference to its contiguous small-cell that the increase that can reduce owing to unloading Target cell load causes.
As previously mentioned, this embodiment exceedes predeterminated level mainly for only having a small amount of user's interference level in disturbed contiguous small-cell, and the situation of too large change does not occur the overall spectral efficiency of small-cell.In this case can only switch for being disturbed more serious certain customers in this vicinity small-cell.
Overall interference level for the contiguous small-cell of unloading Target cell exceedes the comparatively serious situation of predeterminated level, load balancing control section can be configured to: when owing to causing the spectrum efficiency of the contiguous small-cell unloading Target cell to reach predetermined quantity lower than the Reference Signal Received Quality of predetermined threshold or contiguous small-cell lower than the user of predetermined threshold to the unloading of unloading Target cell, no longer using this unloading Target cell as unloading target.
In addition, when condition (such as load level is higher than predetermined threshold) that need the adjacent small-cell of small-cell of unloading not possess as unloading Target cell, load balancing control section can carry out controlling making by being offloaded to by this macrocell other small-cells meeting unloading Target cell condition again unloading needing the user of unloading to be offloaded to macrocell.
Or, can be unloaded the adjacent small-cell of adjacent small-cell by multi-hop equilibrium.Such as, when a small-cell needs unloading, but small-cell adjacent with it does not belong to light load cell when thus can not receive user to be unloaded, load balancing control section can carry out controlling to unload to be switched by multi-hop, such as user to be unloaded is switched to adjacent small-cell, and the user in adjacent small-cell is switched to its adjacent small-cell.The detailed process that multi-hop switches is known in the art, does not repeat them here.
In addition, when there is the small-cell closed, the community of closedown can be activated as required, help carry out load balancing process.As shown in Figure 4, according to an embodiment with application, the device 400 for load balancing comprises interference monitoring part 410, load balancing control section 420 and small-cell activating part 430.Wherein, the configuration of interference monitoring part 410 and load balancing control section 420 and above-mentioned interference monitoring part and load balancing control section similar, no longer describe in detail at this.Small-cell activating part 430 is configured to: do not possess condition as unloading Target cell needing the contiguous small-cell of carrying out the small-cell unloaded, and when the surrounding carrying out the small-cell unloaded exists the small-cell of closedown, open the small-cell of this closedown.
In addition, such as when above-mentioned carry out load balancing by multi-hop process, if need by certain close small-cell carry out this multi-hop switching, also can be opened the small-cell of this closedown by small-cell activating part.
Or, load balancing apparatus can know the load state of the contiguous small-cell closing small-cell, if there is heavily loaded small-cell in its contiguous small-cell, the small-cell of closedown then can be indicated to send signal (such as signal condition information reference signal CSI-RS, main synchronizing sequence PSS and secondary synchronization sequences SSS), when the above-mentioned signal strength signal intensity recorded in this heavily loaded small-cell higher than the number of users of certain threshold value higher than then opening this closedown small-cell during certain thresholding.
Correspondingly, according to an embodiment of the application, small-cell activating part can be configured to: when needing the user carrying out the signal of the community that closedown can be detected in the small-cell unloaded to reach predetermined quantity, open the small-cell of this closedown.
Above in the description process of the device for load balancing in the application's execution mode, obviously also disclose some process or methods.Hereinafter, the general introduction of these methods is provided when some details not repeating above to have discussed.But although it should be noted that it is disclose these methods in the process for the device of load balancing of description, but these methods might not be performed by these parts above-mentioned.
As shown in Figure 5, comprise according to the method for the load balancing in wireless communication system of the embodiment of the present application: monitor the interference (S510) between the small-cell that caused by load balancing process and adjust load balancing process (S520) according to the interference between monitored small-cell.
As previously mentioned, the business load that this load balancing process corresponds to unloading cell-of-origin turns by the process born of unloading Target cell, and it can comprise the process that unloads to small-cell from macrocell and/or between small-cell, carry out the process that unloads.
Load-balancing method according to the embodiment of the present application can be undertaken by the logical functional entity be arranged in macro base station, little base station or core-network entities.
In addition, this load balancing process can be trigger according to the business load of macrocell or small-cell in several ways.
As shown in Figure 6, according to an embodiment of the application, determine unloading cell-of-origin and unloading Target cell (S610) of carrying out load balancing process when considering the QoS requirement of business load.Such as, can determine respectively to unload cell-of-origin and unloading Target cell accordingly for GBR traffic and non-GBR business as previously mentioned.Step S620 in Fig. 6 and S510, the S520 in S630 and Fig. 5 is similar, no longer describes in detail at this.
Below in conjunction with Fig. 7 and Fig. 8 A to Fig. 8 C illustrate according to the embodiment of the present application for monitoring in the method for load balancing at the interference be subject to the contiguous small-cell carrying out unloading Target cell in the process unloaded, unloading Target cell by unloading cell-of-origin and the process example determining the adjustment to uninstall process according to monitoring result.
As shown in Figure 7, for the load balancing process of carrying out unloading from macrocell to small-cell, in step S710, monitor the interference that the contiguous small-cell that unloads Target cell in the process of to be carried out to small-cell unloading by macrocell is subject to.In step S720, determine whether monitored interference exceedes predeterminated level (such as, in process unloading object user unloaded in batches, carry out this and determine after completing certain and once unloading).When interference does not exceed predeterminated level (N in S720), continue uninstall process (such as, carrying out the unloading of the user of subsequent batches) in step S730.When interference level exceedes predeterminated level (N in S720), no longer carry out follow-up unloading (S740).
As previously mentioned, may be there is following situation in the interference that uninstall process causes: only have a small amount of user's interference level to exceed predeterminated level in small-cell but the not too large change of generation of the overall spectral efficiency of small-cell, and the interference level of small-cell entirety exceedes predeterminated level (spectrum efficiency of such as small-cell is reduced to certain threshold value, or the user that in small-cell, interference level exceedes predeterminated level reaches predetermined quantity).Load-balancing method according to the embodiment of the present application can adjust load balancing process accordingly according to above-mentioned different situations.
For uninstall process between small-cell, as shown in Fig. 8 A to Fig. 8 C, can monitor unloading object user be subject to after being discharged into unloading Target cell self-unloading cell-of-origin interference (as shown in the S810 in Fig. 8 A) and to the unloading Target cell that causes of unloading of unloading Target cell to the interference (as shown in the S850 in S830 and Fig. 8 C in Fig. 8 B) of contiguous small-cell.
Particularly, as shown in Figure 8 A, when unloading object user when the interference being subject to self-unloading cell-of-origin after being discharged into unloading Target cell exceedes predeterminated level (Y in S810), then progressively reduce power according to predetermined step-length, to reduce the interference to unloading object user in step S820 notice unloading cell-of-origin.
As shown in Figure 8 B, when unloading object user when causing the interference of its contiguous small-cell to exceed predeterminated level after being discharged into unloading Target cell because the load unloading Target cell increases (Y in S830), then in step S840, the user that is disturbed in this vicinity small-cell is switched to this unloading Target cell, and progressively reduce the power of this vicinity small-cell according to predetermined step-length.This process can be directed in the small-cell that is disturbed the situation that too large change does not occur the overall spectral efficiency only having a small amount of user's interference level to exceed predeterminated level and small-cell.
As shown in Figure 8 C, when unload cause the spectrum efficiency of the contiguous small-cell unloading Target cell to reach predetermined quantity lower than the Reference Signal Received Quality of predetermined threshold maybe this vicinity small-cell lower than the user of predetermined threshold when (Y in S850), then make this unloading Target cell not be re-used as unloading target in step S860.This process can be directed to the situation that the interference level being disturbed small-cell entirety exceedes predeterminated level.
Next, be described according to the macro base station of the embodiment of the present application and little base station with reference to Fig. 9 and Figure 10.
As shown in Figure 9, interfere information acquisition device 910 and load balancing apparatus 920 is comprised according to the macro base station 900 of the embodiment of the present application.
Interfere information acquisition device 910 is configured to obtain interfere information, and this interfere information comprises: the information of the interference causing the contiguous small-cell unloading Target cell to be subject to about being carried out unloading to small-cell by macro base station 900.
Wherein, interfere information acquisition device 910 directly can obtain this interfere information and (such as, by linking with each small-cell, directly obtain the disturbed condition of each small-cell; Or, by reporting disturbed condition to obtain disturbed condition by each small-cell), also can receive this interfere information from other logical functional entities (being such as disposed in other macro base stations, little base station or core-network entities).
Load balancing apparatus 920 is configured to the load balancing process of carrying out between small-cell according to interfere information.
Wherein, load balancing apparatus 920 directly can generate control signal according to obtained interfere information, carrys out control load balancing procedure.Or load balancing apparatus 920 also can carry out load balancing process based on the signaling generated based on interfere information received from other logical functional entities (being such as disposed in other macro base stations, little base station or core-network entities).
According to a specific embodiment, load balancing apparatus 920 is configured to: when the instruction of obtained interfere information carried out unloading to small-cell by macro base station 900 and cause unloading interference that the contiguous small-cell of Target cell is subject to exceed predeterminated level, the user of interference is caused to switch back macro base station 900 by due to its unloading, and no longer using the unloading object of this user as discharged later process.
According to a specific embodiment, the interfere information that interfere information acquisition device 910 obtains comprises: about the information of the spectrum efficiency of the contiguous small-cell of unloading Target cell, or about Reference Signal Received Quality in the contiguous small-cell of unloading Target cell lower than the information of the quantity of the user of predeterminated level.And, load balancing apparatus 920 is configured to: when the interfere information that interfere information acquisition device 910 obtains indicates the spectrum efficiency of this vicinity small-cell to reach predetermined quantity lower than the Reference Signal Received Quality of predetermined threshold or this vicinity small-cell lower than the user of predeterminated level, make this Target cell not be re-used as unloading Target cell.
As shown in Figure 10, interfere information acquisition device 1010 and load balancing apparatus 1020 is comprised according to the little base station 1000 of the embodiment of the present application.
Interfere information acquisition device 1010 is configured to obtain interfere information, this interfere information comprises: be subject to the information of the interference from this small-cell after being unloaded to Target cell from this small-cell about unloading object user, or causes this vicinity small-cell load increase about the unloading accepted by contiguous small-cell from macrocell or other small-cells thus the information of interference to this small-cell.
Wherein, interfere information acquisition device 1010 directly can obtain the information of the interference about this small-cell.For the interfere information of contiguous small-cell, interfere information acquisition device 1010 such as can: by link with contiguous small-cell, obtain the disturbed condition of contiguous small-cell; By reporting disturbed condition by contiguous small-cell to macrocell, obtain disturbed condition from macrocell; Or, this interfere information can be received from other logical functional entities (being such as disposed in other macro base stations, little base station or core-network entities).
The interfere information that load balancing apparatus 1020 is configured to obtain according to interfere information acquisition device 1010 carries out the load balancing process between other small-cells.
Wherein, load balancing apparatus 1020 can: directly generate control signal according to obtained interfere information, carry out control load balancing procedure; Load balancing process is carried out according to the control signal from macro base station; Or, based on receive from other logical functional entities (being such as disposed in other macro base stations, little base station or core-network entities), the signaling that generates based on interfere information carries out load balancing process.
According to a specific embodiment, load balancing apparatus 1020 is configured to: when the interfere information instruction unloading object user that interfere information acquisition device 1010 obtains is subject to exceeding predeterminated level from the interference of this small-cell after being unloaded to Target cell from this small-cell, little base station 1000 is made progressively to reduce power according to predetermined step-length, to reduce the interference to this unloading object user.
According to another specific embodiment, load balancing apparatus 1020 is configured to: when the interfere information instruction that interfere information acquisition device 1010 obtains accepts unloading by contiguous small-cell and causes this vicinity small-cell interference to this small-cell to exceed predeterminated level, the user that is disturbed of this small-cell is switched to this vicinity small-cell, and progressively reduces the power of little base station 1000 according to predetermined step-length.
According to a specific embodiment, the interfere information that interfere information acquisition device 1010 obtains comprises: about the information of the spectrum efficiency of the small-cell of little base station 1000, or about the Reference Signal Received Quality of the small-cell of little base station 1000 lower than the information of the quantity of the user of predeterminated level.And, load balancing apparatus 1020 is configured to: when the instruction of interfere information that interfere information acquisition device 1010 obtains accepts unloading by contiguous small-cell and causes the spectrum efficiency of this small-cell to reach predetermined quantity lower than the Reference Signal Received Quality of predetermined threshold or this small-cell lower than the user of predeterminated level, this vicinity small-cell is not re-used as and unloads Target cell.
In addition, unloading source/target determining section (not shown) can also be comprised according to the little base station of an embodiment of the application, it is configured to the average traffic load capacity of the small-cell bunch overall calculation of the small-cell providing the business load amount of the small-cell of service according to this little base station and comprise multiple vicinity, determine that this small-cell can be used as unloading cell-of-origin or unloading Target cell, wherein, the result that load balancing apparatus is also configured to determine according to this unloading source/target determining section carries out the load balancing process between other small-cells.
Exemplarily, each step of said method and all modules of said apparatus and/or unit may be embodied as software, firmware, hardware or its combination.When being realized by software or firmware, to the computer (all-purpose computer 1100 such as shown in Figure 11) with specialized hardware structure, the program being configured for the software implementing said method can be installed from storage medium or network, this computer, when being provided with various program, can perform various functions etc.
In fig. 11, operation processing unit (i.e. CPU) 1101 performs various process according to the program stored in read-only memory (ROM) 1102 or from the program that storage area 1108 is loaded into random-access memory (ram) 1103.In RAM1103, also store the data required when CPU1101 performs various process etc. as required.CPU1101, ROM1102 and RAM1103 are via bus 1104 link each other.Input/output interface 1105 also link to bus 1104.
Following parts link is to input/output interface 1105: importation 1106(comprises keyboard, mouse etc.), output 1107(comprises display, such as cathode ray tube (CRT), liquid crystal display (LCD) etc., and loud speaker etc.), storage area 1108(comprises hard disk etc.), communications portion 1109(comprises network interface unit such as LAN card, modulator-demodulator etc.).Communications portion 1109 is via network such as internet executive communication process.As required, driver 1110 also can link to input/output interface 1105.Detachable media 1111 such as disk, CD, magneto optical disk, semiconductor memory etc. are installed on driver 1110 as required, and the computer program therefrom read is installed in storage area 1108 as required.
When series of processes above-mentioned by software simulating, from network such as internet or storage medium, such as detachable media 1111 installs the program forming software.
It will be understood by those of skill in the art that this storage medium is not limited to wherein having program stored therein shown in Figure 11, distributes the detachable media 1111 to provide program to user separately with equipment.The example of detachable media 1111 comprises disk (comprising floppy disk (registered trade mark)), CD (comprising compact disc read-only memory (CD-ROM) and digital universal disc (DVD)), magneto optical disk (comprising mini-disk (MD) (registered trade mark)) and semiconductor memory.Or hard disk that storage medium can be ROM1102, comprise in storage area 1108 etc., wherein computer program stored, and user is distributed to together with comprising their equipment.
The present invention also proposes a kind of program product storing the instruction code of machine-readable.When described instruction code is read by machine and performs, the above-mentioned method according to the embodiment of the present invention can be performed.
Correspondingly, be also included within of the present invention disclosing for carrying the above-mentioned storage medium storing the program product of the instruction code of machine-readable.Described storage medium includes but not limited to floppy disk, CD, magneto optical disk, storage card, memory stick etc.
Above in the description of the specific embodiment of the invention, the feature described for a kind of execution mode and/or illustrate can use in one or more other execution mode by same or similar mode, combined with the feature in other execution mode, or substitute the feature in other execution mode.
Should emphasize, term " comprises/comprises " existence referring to feature, key element, step or assembly when using herein, but does not get rid of the existence or additional of one or more further feature, key element, step or assembly.
In above-described embodiment and example, have employed the Reference numeral of numeral composition to represent each step and/or unit.Those of ordinary skill in the art should be understood that these Reference numerals just for the ease of describing and drawing, and not represents its order or any other restriction.
In addition, method of the present invention be not limited to specifications in describe time sequencing perform, also can according to other time sequencing ground, perform concurrently or independently.Therefore, the execution sequence of the method described in this specification is not construed as limiting technical scope of the present invention.
Although above by the description of specific embodiments of the invention to invention has been disclosure, should be appreciated that, above-mentioned all embodiments and example are all illustrative, and not restrictive.Those skilled in the art can design various amendment of the present invention, improvement or equivalent in the spirit and scope of claims.These amendments, improvement or equivalent also should be believed to comprise in protection scope of the present invention.

Claims (32)

1., for a device for the load balancing in wireless communication system, comprising:
Interference monitoring part, is configured to monitor the interference between the small-cell that caused by load balancing process; And
Load balancing control section, is configured to adjust described load balancing process according to the interference between the small-cell that monitored by described interference monitoring part.
2. device according to claim 1, wherein, the business load that described load balancing process corresponds to unloading cell-of-origin turns by the process born of unloading Target cell, comprises the process that unloads to small-cell from macrocell and/or between small-cell, carries out the process that unloads.
3. device according to claim 2, also comprises:
Unloading source/target determining section, the business load amount being configured to the one or more small-cells managed according to described device and the average traffic load capacity of the small-cell bunch overall calculation of the small-cell comprising multiple vicinity, determine the unloading cell-of-origin in described load balancing process or unloading Target cell.
4. device according to claim 3, wherein, described unloading source/target determining section is also configured to the unloading cell-of-origin and/or the unloading Target cell that determine carrying out described load balancing process according to the QoS requirement of different business load,
Wherein, described unloading source/target determining section is according to ensureing that shared by bit rate service, Resource Block ratio R and/or user can distribute the non-ensured bit rate service Resource Block obtained amount R ' determine the unloading cell-of-origin of load balancing process and/or unload Target cell.
5. device according to claim 4, wherein, described unloading source/target determining section for comprise multiple vicinity small-cell small-cell bunch overall calculation described in ratio R or described amount R ' to determine the thresholding of respective load balancing procedure between the small-cell in this small-cell bunch.
6. device according to claim 5, wherein, described unloading source/target determining section is configured in the thresholding of described respective load balancing procedure, introduce corresponding predetermined amount of hysteresis for determining unloading cell-of-origin and unloading Target cell, to avoid, between unloading cell-of-origin and unloading Target cell, ping-pong occurs.
7. device according to claim 5, wherein, described load balancing control section is configured to: the small-cell bunch described ratio R being greater than to predetermined threshold, does not carry out the unloading of macrocell to small-cell to small-cell wherein.
8. the device according to any one of claim 1-7, wherein, described interference monitoring part is configured to: monitor in the interference be subject to the contiguous small-cell that unloading Target cell carries out unloading Target cell in the process unloaded by unloading cell-of-origin, and
Described load balancing control section is configured to: determine the adjustment to uninstall process according to the monitoring result of described interference monitoring part.
9. device according to claim 8, wherein, described interference monitoring part is configured to: monitor the interference that the contiguous small-cell that unloads Target cell in the process of to be carried out to small-cell unloading by macrocell is subject to, and
Described load balancing control section is configured to: determine whether to proceed follow-up uninstall process according to the monitoring result of described interference monitoring part.
10. device according to claim 9, wherein, described load balancing control section is configured to: when exceeding predeterminated level due to unloading to the interference that the contiguous small-cell of described unloading Target cell is caused, the user of interference is caused to switch back described macrocell by due to its unloading, and no longer using the unloading object of this user as discharged later process.
11. devices according to claim 9, wherein, described interference monitoring part is configured to: monitor the quantity of Reference Signal Received Quality lower than the user of predeterminated level owing to causing the spectrum efficiency of the contiguous small-cell of this unloading Target cell or contiguous small-cell to the unloading of unloading Target cell, and
Described load balancing control section is configured to: when the spectrum efficiency of described contiguous small-cell reaches predetermined quantity lower than the Reference Signal Received Quality of predetermined threshold or described contiguous small-cell lower than the user of predeterminated level, make this unloading Target cell not be re-used as unloading Target cell.
12. devices according to claim 8, wherein, described interference monitoring part is configured to, for uninstall process between small-cell, monitoring: unloading object user, after being discharged into unloading Target cell, is subject to the interference of self-unloading cell-of-origin; And to the unloading Target cell that causes of unloading of unloading Target cell to the interference of contiguous small-cell.
13. devices according to claim 12, wherein, described load balancing control section is configured to: when the interference that unloading object user is subject to self-unloading cell-of-origin after being discharged into unloading Target cell exceedes predeterminated level, notify that described unloading cell-of-origin progressively reduces power according to predetermined step-length, to reduce the interference to described unloading object user.
14. devices according to claim 12, wherein, described load balancing control section is configured to: when unloading object user causes the interference of its contiguous small-cell to exceed predeterminated level due to the increase unloading Target cell load after being discharged into unloading Target cell, the user that is disturbed of described contiguous small-cell is switched to described unloading Target cell, and progressively reduces the power of described contiguous small-cell according to predetermined step-length.
15. devices according to claim 12, wherein, described load balancing control section is configured to: when owing to causing the spectrum efficiency of the contiguous small-cell unloading Target cell to reach predetermined quantity lower than the Reference Signal Received Quality of predetermined threshold or contiguous small-cell lower than the user of predetermined threshold to the unloading of unloading Target cell, no longer using this unloading Target cell as unloading target.
16. devices according to claim 12, wherein, described load balancing control section is configured to: when the condition needing the adjacent small-cell of carrying out the small-cell unloaded not possess as unloading Target cell, is offloaded to other small-cells meeting unloading Target cell condition again unloads by being offloaded to macrocell by this macrocell.
17. devices according to any one of claim 1-7, also comprise small-cell activating part, be configured to: do not possess condition as unloading Target cell needing the contiguous small-cell of carrying out the small-cell unloaded, and when the surrounding carrying out the small-cell unloaded exists the small-cell of closedown, open the small-cell of this closedown.
18. devices according to any one of claim 1-7, also comprise small-cell activating part, be configured to: when needing the user carrying out the signal of the community that closedown can be detected in the small-cell unloaded to reach predetermined quantity, open the small-cell of this closedown.
19. devices according to any one of claim 1-7, wherein, described device is arranged in little base station, macro base station or core network entity.
20. 1 kinds, for the method for the load balancing in wireless communication system, comprising:
Interference between the small-cell that monitoring is caused by load balancing process; And
Described load balancing process is adjusted according to the interference between monitored small-cell.
21. methods according to claim 20, wherein, the business load that described load balancing process corresponds to unloading cell-of-origin turns by the process born of unloading Target cell, comprises the process that unloads to small-cell from macrocell and/or between small-cell, carries out the process that unloads.
22. methods according to claim 20 or 21, wherein, monitor in the interference be subject to the contiguous small-cell that unloading Target cell carries out unloading Target cell in the process unloaded by unloading cell-of-origin, and
The adjustment to uninstall process is determined according to monitoring result.
23. methods according to claim 22, wherein, monitor the interference that the contiguous small-cell that unloads Target cell in the process of to be carried out to small-cell unloading by macrocell is subject to, and
Determine whether to proceed follow-up uninstall process according to monitoring result.
24. methods according to claim 22, wherein, for uninstall process between small-cell, monitoring: unloading object user, after being discharged into unloading Target cell, is subject to the interference of self-unloading cell-of-origin; And to the unloading Target cell that causes of unloading of unloading Target cell to the interference of contiguous small-cell.
25. 1 kinds of macro base stations, it comprises:
Interfere information acquisition device, be configured to obtain interfere information, described interfere information comprises: the information of the interference causing the contiguous small-cell unloading Target cell to be subject to about being carried out unloading to small-cell by described macro base station; And
Load balancing apparatus, is configured to the load balancing process of carrying out between small-cell according to described interfere information.
26. macro base stations according to claim 25, wherein, described load balancing apparatus is configured to: when described interfere information indicates described interference to exceed predeterminated level, the user of interference is caused to switch back described macro base station by due to its unloading, and no longer using the unloading object of this user as discharged later process.
27. macro base stations according to claim 25, wherein, described interfere information comprises: about the information of the spectrum efficiency of the contiguous small-cell of described Target cell, or about the Reference Signal Received Quality of the contiguous small-cell of described Target cell lower than the information of the quantity of the user of predeterminated level, and
Described load balancing apparatus is configured to: when the spectrum efficiency of the described contiguous small-cell of described interfere information instruction reaches predetermined quantity lower than the Reference Signal Received Quality of predetermined threshold or described contiguous small-cell lower than the user of predeterminated level, make this Target cell not be re-used as unloading Target cell.
28. 1 kinds of little base stations, it comprises:
Interfere information acquisition device, be configured to obtain interfere information, described interfere information comprises: be subject to the information of the interference from this small-cell after being unloaded to Target cell from this small-cell about unloading object user, or causing this vicinity small-cell to the information of the interference of this small-cell about accepting unloading by contiguous small-cell; And
Load balancing apparatus, is configured to the load balancing process of carrying out between other small-cells according to described interfere information.
29. little base stations according to claim 28, wherein, described load balancing apparatus is configured to: when described interfere information instruction unloading object user is subject to exceeding predeterminated level from the interference of this small-cell after being unloaded to Target cell from this small-cell, described little base station power is progressively reduced, to reduce the interference to described unloading object user according to predetermined step-length.
30. little base stations according to claim 28, wherein, described load balancing apparatus is configured to: when described interfere information instruction accepts unloading by contiguous small-cell and causes this vicinity small-cell interference to this small-cell to exceed predeterminated level, the user that is disturbed of this small-cell is switched to this vicinity small-cell, and progressively reduces the power of described little base station according to predetermined step-length.
31. little base stations according to claim 28, wherein, described interfere information comprises: about the information of the spectrum efficiency of this small-cell, or about the Reference Signal Received Quality of this small-cell lower than the information of the quantity of the user of predeterminated level, and
Described load balancing apparatus is configured to: when the instruction of described interfere information accepts unloading by contiguous small-cell and causes the spectrum efficiency of this small-cell to reach predetermined quantity lower than the Reference Signal Received Quality of predetermined threshold or this small-cell lower than the user of predeterminated level, this vicinity small-cell is not re-used as and unloads Target cell.
32. little base stations according to claim 28, also comprise:
Unloading source/target determining section, be configured to the average traffic load capacity of the small-cell bunch overall calculation of the small-cell providing the business load amount of the small-cell of service according to this little base station and comprise multiple vicinity, determine that this small-cell can be used as unloading cell-of-origin or unloading Target cell, wherein
The result that load balancing apparatus is also configured to determine according to described unloading source/target determining section carries out the load balancing process between other small-cells.
CN201310456549.7A 2013-09-29 2013-09-29 Device and method and base station for the load balancing in wireless communication system Expired - Fee Related CN104519527B (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201310456549.7A CN104519527B (en) 2013-09-29 2013-09-29 Device and method and base station for the load balancing in wireless communication system
US14/895,168 US9763138B2 (en) 2013-09-29 2014-09-28 Load balancing apparatus and method for wireless communications system, and base station
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